public void CombineWithOtherCustomMappings(CustomMapping root, IEnumerable <CustomMapping> mappings)
{
lock (root)
{
foreach (var otherMapping in mappings)
{
foreach (var m in otherMapping.Members)
{
if (!root.Members.Contains(m))
{
var oldParams = otherMapping.ArgumentParameters.Select(p => p.Parameter).ToList();
var newParams = root.ArgumentParameters.Select(p => p.Parameter).ToList();
oldParams.Add(otherMapping.SourceParameter);
newParams.Add(root.SourceParameter);
var visitor = new ParameterVisitor(oldParams, newParams);
var member = new MemberExpressionTuple
{
Expression = visitor.Visit(m.Expression),
Member = m.Member
};
root.Members.Add(member);
}
}
}
}
}
private static CustomMapping GetCustomMappingFromNewExpression(Type destinationType, NewExpression expression)
{
var newMapping = new CustomMapping();
newMapping.DestinationType = destinationType;
for (var i = 0; i < expression.Arguments.Count; i++)
{
var member = expression.Members[i];
var argument = expression.Arguments[i];
var memberOnDestination = destinationType.GetMember(member.Name).FirstOrDefault();
if (memberOnDestination == null)
{
throw new ArgumentException(string.Format("Member {0} does not exist on type {1}", member.Name, destinationType.Name));
}
var memberExpression = new MemberExpressionTuple();
memberExpression.Member = memberOnDestination;
if (argument is NewExpression)
{
var cm = GetCustomMappingFromNewExpression(memberExpression.Member.PropertyOrFieldType, (NewExpression)argument);
if (cm != null)
{
newMapping.CustomMappings.Add(cm);
}
}
else
{
memberExpression.Expression = argument;
}
newMapping.Members.Add(memberExpression);
}
return(newMapping);
}
private static CustomMapping GetCustomMappingFromMemberInitExpression(Type destinationType, MemberInitExpression expression)
{
var newMapping = new CustomMapping();
newMapping.DestinationType = destinationType;
foreach (MemberAssignment assignment in expression.Bindings)
{
var member = assignment.Member;
var argument = assignment.Expression;
var memberOnDestination = destinationType.GetMember(member.Name).FirstOrDefault();
if (memberOnDestination == null)
{
throw new ArgumentException(string.Format("Member {0} does not exist on type {1}", member.Name, destinationType.Name));
}
var memberExpression = new MemberExpressionTuple();
memberExpression.Member = memberOnDestination;
var argAsNewExpression = argument as NewExpression;
if (argAsNewExpression != null && argAsNewExpression.Members != null)
{
newMapping.CustomMappings.Add(GetCustomMappingFromNewExpression(memberExpression.Member.PropertyOrFieldType, (NewExpression)argument));
}
else
{
memberExpression.Expression = argument;
}
newMapping.Members.Add(memberExpression);
}
return(newMapping);
}
private void BuildMemberAssignmentExpressions(Expression sourceAccess, List<MemberBinding> memberBindings, ProposedMemberMapping member, CustomMapping customMapping)
{
if (member.Ignored)
{
return;
}
Expression customExpression;
MemberAssignment bindSourceToDest;
if (customMapping != null && (customExpression = customMapping.GetExpressionForMember(member.DestinationMember)) != null)
{
processor.ParametersToReplace.Add(new ProjectionExpressionTuple(customMapping.SourceParameter, sourceAccess));
bindSourceToDest = Expression.Bind(member.DestinationMember, customExpression);
}
else
{
Expression accessMember = Expression.MakeMemberAccess(sourceAccess, member.SourceMember);
accessMember = HandleNullableValueTypes(member, accessMember);
bindSourceToDest = Expression.Bind(member.DestinationMember, accessMember);
}
memberBindings.Add(bindSourceToDest);
}
/// <summary>
/// Processes a mapping for a type.
/// </summary>
private void BuildTypeMappingExpressions(
ParameterExpression source,
ParameterExpression destination,
ProposedTypeMapping typeMapping,
List<Expression> expressions,
CustomMapping customMapping = null
)
{
// If there's custom mapping defined
if (customMapping != null)
{
// Custom mapping has a source parameter that needs to be replaced with actual parameter
mapProcessor.ParametersToReplace.Add(new ExpressionTuple(customMapping.SourceParameter, source));
// Custom mapping may contain more parameters that represent arguments in the custom mapping
foreach (var param in customMapping.ArgumentParameters)
{
// Find the corresponding parameter that we want to replace the custom mapping's placeholder with
var correspondingParam = this.Parameters.Single(p => p.Index == param.Index);
mapProcessor.ParametersToReplace.Add(new ExpressionTuple(param.Parameter, correspondingParam.Parameter));
}
}
// Simple property assignments
foreach (var member in typeMapping.ProposedMappings)
{
BuildMemberAssignmentExpressions(source, destination, member, expressions, typeMapping, customMapping);
}
// Nested type mappings
foreach (var complexTypeMapping in typeMapping.ProposedTypeMappings)
{
// If it's a collection type
if (typeMapping.IsEnumerable || CollectionTypeHelper.IsEnumerable(complexTypeMapping))
{
BuildEnumerableMappingExpressions(source, destination, complexTypeMapping, expressions);
}
else
{
// If it's not a collection but just a nested type
BuildComplexTypeMappingExpressions(source, destination, complexTypeMapping, expressions);
}
}
}
/// <summary>
/// Assign source member to a destination mapping, applying any custom mappings in the process.
/// </summary>
private void BuildMemberAssignmentExpressions(
ParameterExpression source,
ParameterExpression destination,
ProposedMemberMapping member,
List<Expression> expressions,
ProposedTypeMapping typeMapping,
CustomMapping customMapping = null
)
{
if (member.Ignored)
{
return;
}
Expression condition = null;
if (member.Condition != null)
{
mapProcessor.ParametersToReplace.Add(new ExpressionTuple(member.Condition.Parameters.Single(), this.sourceParameter));
condition = member.Condition.Body;
}
var destMember = Expression.MakeMemberAccess(destination, member.DestinationMember);
Expression assignSourceToDest = null;
Expression customExpression = null;
Expression assignConversionToDest = null;
LambdaExpression conversionFunction = null;
bool conversionReturnTypeSameAsParameterType = false;
ParameterExpression conversionParameter = null;
if (customMapping != null)
{
conversionFunction = customMapping.GetConversionFunction(member.SourceMember, member.DestinationMember);
if (conversionFunction != null)
{
conversionParameter = conversionFunction.Parameters.Single();
conversionReturnTypeSameAsParameterType = conversionParameter.Type == conversionFunction.ReturnType;
}
}
if (customMapping != null && (customExpression = customMapping.GetExpressionForMember(member.DestinationMember)) != null)
{
assignSourceToDest = Expression.Assign(destMember, customExpression);
}
else if (member.HierarchicalMapping != null)
{
var accessHierarchy = BuildHierarchicalExpression(source, member.HierarchicalMapping, null);
if (destMember.Type.IsNullableValueType())
{
accessHierarchy = Expression.Convert(accessHierarchy, destMember.Type);
}
assignSourceToDest = Expression.Assign(destMember, accessHierarchy);
}
else
{
Expression sourceExpression = Expression.MakeMemberAccess(source, member.SourceMember);
bool usesConversionFunction = false;
if (conversionFunction != null && !conversionReturnTypeSameAsParameterType)
{
ValidateConversionFunction(conversionFunction, conversionParameter, sourceExpression, destMember);
this.mapProcessor.ParametersToReplace.Add(new ExpressionTuple(conversionParameter, sourceExpression));
sourceExpression = conversionFunction.Body;
usesConversionFunction = true;
}
assignSourceToDest = AssignSimpleProperty(member, destMember, sourceExpression, typeMapping, usesConversionFunction);
}
if (conversionFunction != null && conversionReturnTypeSameAsParameterType)
{
this.mapProcessor.ParametersToReplace.Add(new ExpressionTuple(conversionParameter, destMember));
assignConversionToDest = Expression.Assign(destMember, conversionFunction.Body);
}
// If a condition to the mapping was specified
if (condition != null)
{
if (assignConversionToDest != null)
{
assignSourceToDest = Expression.Block(assignSourceToDest, assignConversionToDest);
}
var ifCondition = Expression.IfThen(condition, assignSourceToDest);
expressions.Add(ifCondition);
}
else
{
expressions.Add(assignSourceToDest);
if (assignConversionToDest != null)
{
expressions.Add(assignConversionToDest);
}
}
}
private void BuildTypeMappingExpressions(ParameterExpression source, ParameterExpression destination, ProposedTypeMapping typeMapping, List<Expression> expressions, List<ParameterExpression> newParams, CustomMapping customMapping = null)
{
foreach (var member in typeMapping.ProposedMappings)
{
BuildSimpleTypeMappingExpressions(source, destination, member, expressions, newParams, customMapping);
}
foreach (var complexTypeMapping in typeMapping.ProposedTypeMappings)
{
if (typeMapping.IsEnumerable || CollectionTypeHelper.IsEnumerable(complexTypeMapping))
{
BuildCollectionComplexTypeMappingExpressions(source, destination, complexTypeMapping, expressions, newParams);
}
else
{
BuildNonCollectionComplexTypeMappingExpressions(source, destination, complexTypeMapping, expressions, newParams);
}
}
}
private void BuildSimpleTypeMappingExpressions(ParameterExpression source, ParameterExpression destination, ProposedMemberMapping member, List<Expression> expressions, List<ParameterExpression> newParams, CustomMapping customMapping = null)
{
Expression sourceExpression = Expression.PropertyOrField(source, member.SourceMember.Name);
var destMember = Expression.PropertyOrField(destination, member.DestinationMember.Name);
BinaryExpression assignSourceToDest;
Expression customExpression;
if (customMapping != null && (customExpression = customMapping.GetExpressionForMember(member.DestinationMember)) != null)
{
var visitor = new ParameterVisitor(customMapping.Parameter, source);
customExpression = visitor.Visit(customExpression);
assignSourceToDest = Expression.Assign(destMember, customExpression);
}
else
{
assignSourceToDest = Expression.Assign(destMember, sourceExpression);
}
expressions.Add(assignSourceToDest);
}
private static CustomMapping GetCustomMappingFromNewExpression(Type destinationType, NewExpression expression)
{
var newMapping = new CustomMapping();
newMapping.DestinationType = destinationType;
for (var i = 0; i < expression.Arguments.Count; i++)
{
var member = expression.Members[i];
var argument = expression.Arguments[i];
var memberOnDestination = destinationType.GetMember(member.Name).FirstOrDefault();
if (memberOnDestination == null)
{
throw new ArgumentException(string.Format("Member {0} does not exist on type {1}", member.Name, destinationType.Name));
}
var memberExpression = new MemberExpressionTuple();
memberExpression.Member = memberOnDestination;
if (argument is NewExpression)
{
newMapping.CustomMappings.Add(GetCustomMappingFromNewExpression(memberExpression.Member.PropertyOrFieldType, (NewExpression)argument));
}
else
{
memberExpression.Expression = argument;
}
newMapping.Members.Add(memberExpression);
}
return newMapping;
}
